Apex domains cannot have CNAME records.
Question and response
Question
dig awsdns-60.com. NS
Answer
awsdns-60.com. 5 NS g-ns-1212.awsdns-60.com.
awsdns-60.com. 5 NS g-ns-636.awsdns-60.com.
awsdns-60.com. 5 NS g-ns-61.awsdns-60.com.
awsdns-60.com. 5 NS g-ns-1788.awsdns-60.com.
Authority
The response has no authority records.
Additional
g-ns-61.awsdns-60.com. 5 A 205.251.192.61
g-ns-636.awsdns-60.com. 5 A 205.251.194.124
g-ns-1212.awsdns-60.com. 5 A 205.251.196.188
g-ns-1788.awsdns-60.com. 5 A 205.251.198.252
g-ns-61.awsdns-60.com. 5 AAAA 2600:9000:5300:3d00:0:0:0:1
g-ns-636.awsdns-60.com. 5 AAAA 2600:9000:5302:7c00:0:0:0:1
g-ns-1212.awsdns-60.com. 5 AAAA 2600:9000:5304:bc00:0:0:0:1
g-ns-1788.awsdns-60.com. 5 AAAA 2600:9000:5306:fc00:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0